Adjustable chairs



Feb. 23, 1960 Filed Feb. 9, 1956 P. s. FLETCHER 2,925,853

ADJUSTABLE CHAIRS 5 Sheets-Sheet 1 Feb. 23, 1960 P. s. FLETCHER 2,925,853

ADJUSTABLE CHAIRS Filed Feb. 9, 1956 r 5 Sheets-Sheet 2 IN V EN TOR.

Feb. 23, 1960 P. s. FLETCHER 2,925,353

ADJUSTABLE CHAIRS Filed Feb. 9, 1956 5 Sheets-Sheet 3 'll' f 8 s i.

IN V EN TOR.

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Feb. 23, 1960 P. s. FLETCHER 2,925,853

ADJUSTABLE CHAIRS Filed Feb. 9, 1956 5 Sheets-Sheet 4 a a f// j A 67 1 INVENTOR.

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ADJUSTABLE CHAIRS Filed Feb. 9, 1956 5 Sheets-Sheet 5 IN VEN TOR.

United tates Patent ADJUSTABLE CHAIRS Peter Stewart Fletcher, Boynton Beach, Fla, assignor to Anton Lorenz, Boynton Beach, Fla.

Application February 9, 1956, Serial No. 564,475

11 Claims. (Cl. 155-106) This invention relates to adjustable chairs, and particularly to those having a leg rest which is automatically elevated into leg-supporting position when the chair is adjusted into a reclining or tilted position.

An object of this invention is to provide an improved adjustable chair mechanism with which the back rest and seat may be adjusted selectively into sitting position or tilted position by relatively simple operations; with which a leg rest will be automatically elevated to a leg-supporting position in front of the seat when the back rest and seat are adjusted into tilted position; which employs a new and novel arrangement of linkages in a lazy tong arrangement for elevating the leg rest when the back rest is adjusted into its tilted position; with which the same linkage may be employed to elevate the forward part of the seat when the back rest is rocked into its tilted position; and which will be relatively simple, convenient, comfortable, compact and inexpensive.

Other objects and advantages will be apparent from the following description of several embodiments of the invention, and the novel features will be particularly pointed out hereinafter in connection with the appended claims.

In the accompanying drawings:

Fig. .1 is a sectional elevation through a chair constructed in accordance with this invention and corresponding to a side view of the chair with one side member removed to show the linkage mechanism by which the leg rest is elevated when the chair is adjusted into its tilted position.

Fig. 2 is a view similar to Fig. l, but with the parts adjusted into tilted positions;

Fig. 2a is a schematic diagram illustrating the principle of operation of the linkage employed in Figs. 1 and 2;

Fig. 3 is a view similar to Figs. 1 and 2 except that the seat and back rest are made integral and a modification of the linkages for elevating the leg rest is employed, the parts being shown in the ordinary sitting position of the chair;

Fig. 4 is a view similar to Fig. 3 but with the parts tilted into a somewhat inclined or tilted position;

Fig. 4a is a schematic diagram illustrating the principleof the linkage employed in Figs. 3 and 4;

Fig. 5 is a view similar to Fig. 1 but illustrating still another embodiment of the invention.

Fig. 6 is a view similar to Fig. 5, but with the parts adjusted into tilted positions;

Fig. 6a is a schematic diagram illustrating the principle of the linkage employed in Figs. 5 and 6;

Fig. 7 is a view similar to Fig. 3 but illustrating still another embodiment of the lazy tong linkage that may be employed.

Fig. 8 is a view similar to Fig. 7 but with the parts adjusted into tilted positions;

Fig. 8a is a schematic diagram illustrating the principle of the linkage employed in Figs. 7 and 8;

Fig. 9 is a view similar-to Fig. 3, but'illustrating still another embodiment of the linkage which may be employed to elevate the leg rest.

Fig. 10 is a view similarto Fig. 9 but with the seat and back rest adjusted into tilted positions, and with the leg rest in its leg-supporting position, and

Fig. 10a is'a schematic diagram illustrating the linkage employed in this embodiment of the invention.

In the embodiment of the invention illustrated in Figs. 1, 2 and 2a, the 'chair includes a support 1 having spaced side members 2 that are connected by cross frame members 3 and 4. The chair also includes a seat 5 and a back rest 6 disposed between the side members 2 of the support and both tiltably mounted on a common pivot rod 7 that is carried by the side members 2. The back rest has a depending arm 8 extending below the pivot rod 7. Disposed beneath the front edge of the seat 5 is a leg rest 9, and this leg rest forms one end of a lazy tong device which, when extended, will elevate the leg rest 9 into the Fig. 2 position, and the other end of which lazy tong device is the seat 5 which provides the support for the lazy tong device and through it supports the leg restj9.

There is a lazy tong device at each side of the seat and each such device includes three pairs of links at each side of the seat. The ends of two pairs of links are pivoted to the seat, and another pair of links is pivoted to the links of the other pairs of links in order to provide the lazy tong linkage device that supports the leg rest. This lazy tong device includes, at each side of the seat 5, a pairof links 10 and 11 which are hinged together at 12, and the link 10 is hinged by pin 13 to the bottom of the seat 5 forwardly from the pivot rod 7. Links 14 and 15 which are hinged together at 16, constitute another pair of links. The link 14 is pivotally connected by pin 17 to the seat 5 and the other link 15 is pivotally connected by pin 18 to the leg rest 9. Links 19 and 20, which are hinged together at 21, constitute another pair of links of the lazy tong device. The link 20 is pivoted by pin 22 to the leg rest 9 at a point below the pivot pin 18.

The link 19 of the last recited pair of links is pivotally connected by pin 23 intermediate of its ends to the link 15 intermediate of its ends, and this link has the end opposite from the hinge 21 pivotally connected by pin 24 to the link 11. The link 11 of the first pair of links has an extension 11E beyond its pin 24 that connects it to the link 19, and is pivotally connected by a pin 25 to the link 14 intermediate of the ends of the latter. This interconnection of the three pairs of links provides the lazy tong device, with a link of each two pairs of links pivotally connected to the seat and with the seat forming one end of the lazy tong device and the leg 'rest forming the other end of it.

A guiding link 26 at each side of the seat is pivotally supported at its upper end on a pivot pin 27 carried by the adjacent side member 2, and this link, at its lower end, is pivotally connected by a pin 28 to a control or actuating link 29 intermediate of the ends of the latter. One end of link 29 is pivotally connected by pin 30 to the lower end of the arm 8 that depends from the back rest 6, and the other end of the link 29 is pivotally connected by the pin 25 to the link 14 of the second pair of links. The link 26 is approximately vertical when the back rest 6 and seat 5 are in their normal, sitting positions shown in Fig. 1. When the back rest 6 is tilted rearwardly on the common pivot rod 7 into the position shown in Fig. 2, the depending arm 8 on the back rest will actuate the link 29 endwise to the left in Fig. 1, and through its connection to the link 14, will cause an extension of the lazy tong device formed of the interconnected links, and thus will elevate the leg rest 9 into the Fig. 2-position. At the same time the links 10 and 14, which are connected to the seat, will support the lazy tong device, and during this endwise movement of the link 29 the link 26 will be rocked into an inclined position, shown inFig. 2, which causes links 10 and 14 to elevate the forward edge of the seat 5 and thus cause the seat to be inclined rearwardly and dwnwardly.. When the back rest 6 is returned to its normal, sitting position, shown in Fig. 1, the link 29 is pulled in the opposite direction and will retract the lazy tong device and return the leg rest 9 to its position below the forward edge of the seat, as shown in Fig. 1. At the same time the movement of the link 26 back into its vertical position will cause a lowering of the forward edge of the seat.

In the embodiment of the invention illustrated in Figs. 3 and 4, the back rest 6 and seat are united into a rigid unit, and this unit is provided with depending lugs 31, one at each side of the seat, and each lug is pivotally connected by a pin 32 to the upper end of a lever 33 which, in turn, is pivoted on a common pivot rod 34 that is carried by the support 1. The lower end of the lever 33 is pivotally connected by a pin 35 to one end of an actuating link 36 which serves to actuate the lazy tong device that operates the leg rest 9 into the position shown in Fig. 4. A guiding link 37 is disposed in an approximately upright position when the seat 5 is in its normal sitting position. This link 37 is hinged by pin 38 to a lug on a cross bar 39 of the support 1. The upper end of the link 37 is pivoted by a pin 38 to the seat 5.

The lazy tong device which is carried on the seat at each side thereof and mounts the leg rest 9 is also composed of three pairs of links at each side of the seat, with the ends of links of two pairs pivoted to the seat. Links 40 and 41 which are hinged together by pin 42, form one of the three pairs of links at each side of the seat, and the link 40 is pivotally connected by pin 43 to the seat 5, and the actuating link 36 is pivotally connected by pin 44 to the link 49 intermediate of the ends of the latter. Links 45 and 46, hinged together at 47 form another pair of links at each side of the seat, and an end of the link 46 is pivotally connected by pin 48 to the leg rest 9 and the other link 45 is'pivotally connected by a pin 49 to the seat 5. Links 50 and 51, which are hinged together by a pin 52, form another pair of links at each side of the seat.

The link 51 is connected at one end by pin 53 to the leg rest 9, above and spaced from the pin 48 by which link 46 is connected to the leg rest. The link 45 is pivotally connected by pin 54 to the link 51 intermediate of the ends of the latter, and the link 50 at its end opposite from the hinge 52 is pivotally connected by pin 55 to the link 41 intermediate of its ends. The link 41 has an extension 4113 that is pivotally connected by a pin 56 to the link 45, which completes the three sets of quadrilateral links constituting the lazy tong device that is extensible and which supports the leg rest 9 at one end, and is supported from the seat 5 at its other end.

When the seat 5 and back rest 6 are adjusted into the tilted positions shown in Fig. 4, they are moved, rearwardly, which rocks the lever 33 from the Fig. 3 position to the Fig. 4 position about the pivot rod 34, whichraction causes link 36 to be moved endwise to the left in Fig. 3, and, in turn, it then rocks the link 40 clockwise about the pivot pin 43 connecting that link to the seat. This causes an extension of the lazy tong device and elevates the leg rest 9 from the Fig. 3 position to the Fig. 4 position, and during the rearward movement of the seat 5, the guiding link 37 is rocked into an inclined position shown in Fig. 4, but since the pin 32 which supports the combined seat and back rest at a point below the back rest 6 moves rearwardly and downwardly as it moves into reclining position, this will lower the rear edge of the seat and tilt the back rest into the position shown in Fig. 4. As a result, the seat 5 is tilted rearwardly to some extent for its inclined position. Upon pushing the back rest and seat forwardly, back into the Fig. 3 position, the lever 33 will be rocked back into the-Fig. 3 position, past dead center position, so that it will normally remain in the Fig. 3 position, and since the guiding link 37 is then substantially upright, the seat and back rest of the chair will be substantially stable while in sitting position.

In the embodiment of the invention illustrated in Figs. 5 and 6, the seat 5 and back rest 6 are separate, as explained in connection with Figs. 1 and 2, and both are pivotally supported on a common pivot rod 7 carried by the support 1. The back rest has an arm 8 depending below its pivot rod 7, as in Figs. 1 and 2, and at its lower end the arm 8 is pivotally connected by pin 30 to an actuating link 29, as in Figs. 1 and 2. The leg rest 9 is disposed below the forward edge of the seat 5 and forms one end of a lazy tong device, the other end of which is carried by the seat 5. This lazy tong device at each side of the seat is also formed of three pairs of links, which are interconnected to complete the lazy tong device that supports the leg rest 9.

Links .57 and 58 are hinged together at 59 to form one of the three pairs of links at each side of the seat, and the link 57 is pivotally connected by a pin 60 to the seat 5. Links 61 and 62, which are hingedly connected together at 63, form another pair of links at each side of the seat 5. The link 62 is pivotally connected by pin 64 to the leg rest 9 and the other link 61 of that pair is pivotally connected by a pin 65 to the seat 5. Links 66 and 67, which are hingedly connected together at 68, form another pair of links at each side of the seat. The link 67 is pivotally connected by pin 69 to the leg rest 9 above the pin 64, and the link 66 at its end opposite its hinge 69 is connected by pivotpin 70 to an end of link 53. The link 58 has an extension 58E beyond its hinge 59 and there is connected by pin 71 to the link 61 intermediate the ends of the latter, and this pin 71 also connects to the link 61 an intermediate link 72.

The link 67 has an extension 67E beyond its hinge 68 and is pivotally connected by pin 73 to the link 61 between its hinge 63 and the pivot pin 71. This completes the interconnection between the pairs of links and forms a lazy tong device which is carried by the seat and which also mounts the leg rest 9. When the back rest 6 is rocked into its tilted position, shown in Fig. 6, the link 29 will be actuated lengthwise to the left in Fig. 5. A guiding link 74 is pivoted by pin 75 to the support 1 so as to depend therefrom,.and at its lower end is pivotally connected by a pin 76 to one end of the link 72. The actuating link 29 is pivotally connected by pin 77 to the link 74 intermediate of its ends. A link 78 is pivotally connected by pin 79 to the link 74 between the pin 77 and the pivot pin 75. The other end of link 78 is pivotally connected by pin 80 to a lug 81 depending from the seat 5. When the back rest 6 has rocked from its upright position shown in Fig. 5, to its tilted position, shown in Fig. 6, about the pivot rod 7, the depending arm 8 will actuate the link 29 to rock the link 74 clockwise in Fig.5, and this link 74, operating through the link 72, will rockthe link 61 of the lazy tong device, and by extending the latter, will elevate the leg rest 9 from the Fig. 5 position to the Fig. 6 position; at the same time the clockwise movement of the link 74 about pin 75 on the support will move link'78 endwise and raise the for ward edge of the seat into the position shown in Fig. 6. When the back rest-6 is returned to its upright position, shown in Fig. 5, a reverse action takes place, and the link 29 will return thelink 74 to its position shown in Fig. 5, which lowers the forward edge of the seat and at the same time retracts the lazy tong device and returns the leg rest 9 to its normal position below the forward edge of the chair, as shown in Fig. 5.

Referring now to Figs. 7 and 8, the seat 5 and back rest 6 are formed as an integral unit, as shown and explajned .ineonnection with F igs. 3 and 4. This unitof throws the back rest 6 into its tilted position.

seat and back rest is provided at the lower end of and at each side of the back rest with a lug 82 which is pivoted by a pin 83 to the upper end of a lever 84 which is mounted to rock on a pivot rod 85 carried by the support. The lower end of the lever 84 is pivotally connected by pin 86 to one end of an actuating link 87. A guiding link 88 is pivoted at 89 to a lug on the frame member 39 of the support. The link 88 is approximately vertical when the seat and back rest are in their sitting positions, shown in Fig. 7, and the upper end of the guiding link 88 is pivotally connected by pin 90 to a lug 91 that depends from the seat 5.

The leg rest 9 is disposed normally below the front edge of the seat 5, as shown in Fig. 7, and it is supported at each side of the seat on a lazy tong device formed of the three pairs of interconnected links at each side of the seat. Links 92 and 93, which are hinged together at 94, comprise one of the pairs of links at each side of the seat 5. The link 92 is pivotally connected by pin 95 to the seat 5. Links 96 and 97, hinged together at 98, comprise another pair of links at each side of the seat 5. The link 96 is pivotally connected by a pin 99 to the seat 5, and the link 97 is pivotally connected by a pin 100 to the leg rest 9. Links 101 and 102, which are hinged together at 103, comprise still another pair of links at each side of the seat 5. The link 102 is pivotally connected by pin 104 to the leg rest 9 below the pin 100, and link 101 has an extension 101E which is pivotally connected by pin 105 to the link 97 intermediate the ends of the latter. The link 93 is pivotally connected by pin 106 to the link 101, and link 97 has an extension 97E beyond its hinge 98 which extension is pivotally connected by a pin 107 to the link 92 intermediate of the ends of the latter, which completes the lazy tong device at each side of the seat 5. The link 87 is pivotally connected by a pin 108 to the link 92 between the pivot pin 107 and the pivot pin 95.

Thus, when the back rest 6 and seat 5 are moved rearwardly from the Fig. 7 position, they will rock the lever 84 clockwise in Fig. 7 and push the link 87 endwise to the left in Fig. 7, and thus rock the link 92 clockwise about its connection to the seat. This causes an extension of the lazy tong device at each side of the seat and elevates the leg rest 9 from the Fig. 7 position to the Fig. 8 position. During this movement of the seat 5 and back rest 6 in this manner, the junction of the seat and back rest will move rearwardly and downwardly into the positions shown in Fig. 8, which lowers the rear of the seat and The seat at its forward edge will be supported by the guiding link 88, which moves from its approximately vertical position into an inclined position shown in Fig. 8. When the seat and back rest are moved forwardly, the parts will return to their sitting positions shown in Fig. 7.

In the embodiment of the invention illustrated in Figs. 9 and 10, the seat 5 and back rest 6 are formed in a single, rigid unit, as in Figs. 7 and 8, and the bottom of the back rest 6 is provided with a depending lug 109 which is pivotally connected by pivot pin 110 to a lever 111 that is pivotally supported on a pivot rod 112 carried by the support 1. The lever 111 extends upwardly beyond the pivot pin 110, and at its free end is pivotally connected by a pin 113 to one end of an actuating link 114. The seat 5 intermediate of its front and rear edges is pivotally connected by a pin 115 to the upper end of a guiding link 116, the lower end of which is pivotally connected by a pin 117 to a lug 118 provided on a cross frame member 119 of the support 1. The seat and back rest unit is therefore supported by the guiding link 116 and the lever 111, so that when the seat and back rest unit is pushed rearwardly from the Fig. 9 position to the Fig. position, the lever 111 will move past vertical dead center position over the pin 112, and this will both lower the rear end of the seat 5 and rock the back rest 6 into its tilted position. The forward part'of the seat is guided in this movement rearwardly by the guiding link 1 16.

The lazy tong devices which are carried by the seat 5 and support the leg rest 9 are, in this example, also formed ofthree pairs of links at each side of the seat, which are interconnected into extensible, lazy tong devices by which the leg rest 9 may be extended from its normal position shown in Fig. 9 beneath the forward edge of the seat 5, into the leg-supporting position shown in Fig. 10. Links 120 and 121, which are hinged together at 122, form a pair of links at each side of the seat 5, and the link 120 is pivotally connected by pin 115 to the seat 5. The links 124 and 125 which are hinged together at 126,'compn'se another pair of links at each side of the seat 5. The link 124 is pivotally connected by pin 127 to the seat 5, and the link 125 is pivotally connected by pin 128 to the leg rest 9. Links 129 and 130, which are hinged together at 131 comprise still another pair of links at each side of the seat 5'. The link '130 is pivotally connected by pin 132 to the leg rest 9, spaced from the pin 128, and link 129 is pivotally connected by pin 133 to the link 121. Link 121 has an extension 121E that is pivotally connected by a pin 134 to the link 124 intermediate of the ends of the latter. The link 124 also has an extension 124E beyond its hinge 126 which is pivotally connected by pin 135 to the link intermediate of the ends of the latter. This interconnection between the links completes a lazy tong device at each side of the seat which supports the leg rest 9. For convenience, the pin 115 which connects the guiding link 116 to the seat may be the same pin which connects the link 120 to the seat, and in such case the link 120 extends beyond the pivot 115 and is pivotally connected by a pin 136 to one end of the link 114. With this arrangement, as the seat and back rest unit is pushed rearwardly from the Fig. 9 position to the Fig. 10 position, the rocking of the lever 111 will pull endwise on the link 114, to the right in Fig. 9, and this will rock the link 120 clockwise in Fig. 9, so that it causes an extension of the adjacent lazy tong device and elevation of the leg rest 9 into the useful position for supporting the leg, shown in Fig. 10. The fact that this pin 115 also moves slightly to the right in Fig. 9, with the guiding link 116, is of no particular concern because as the seat moves rearwardly, the leg rest 9, while being elevated, will also be moved slightly to the right, since it is carried by the seat, but still will remain in its leg-supporting position in front of the forward edge of the seat 5. When the seat and back rest unit is moved forwardly into the Fig. 9 position, the leg rest 9 will be retracted into its Fig. 9 position.

It will be observed that in each illustrated embodiment of the invention there are three pairs of links at each side of the seat, which pairs may, for convenience of reference, be identified as the first, second and third pairs of links. The links of each pair are hinged or pivoted to each other. Each first pair of links has one of its links pivoted to the leg rest and the other pivoted to some part of the chair. Each second pair of links is that pair which is pivoted to some part of the chair and to one link of the third pair of links whose other link is pivoted to the leg rest. The three pairs of links are operatively interconnected to form a lazy tong device by some means which includes at least one extension of one of the links of a pair.

In Figs. 1 and 2, the first pair comprises links 14 and 15, the second pair comprises links 10 and 11, and the third pair comprises links 19 and 20. The extension of one of the links is 11E. In Figs. 3 and 4, the first pair of links comprises links 45 and 46, the second pair comprises links 40 and 41, and the third pair comprises links 50 and 51. The extension of one of the links is 41E. In Figs. 5 and 6, the first pair of links comprises links 61 and 62, the second pair comprises links 57 and 58, and the third pair comprises links 66 and 67. The extension of one of the links applies to the extensions 58E and 67E. In Figs. 7 and 8,

the first pair of links comprises the links 96 and 97, the second pair comprises links 92 and 93, and the thir pair comprises links 101 and 102. The extension of one of the links applies to extensions 97E and 191E. In Figs. 9 and 10, the first pair of links comprises links 124 and 125, the second pair comprises links 120 and 121, and the third pair comprises links 129 and 130. The extension of one of the links applies to theextensions 121E and 124E.

It .will be understood that there is a lazy tong device at each side of the seat so that the leg rest will be amply supported at both of its ends, and the seat 5 and back rest 6 will also be supported at both sides of the seat 5. Suitable stops, not shown, may be added to limit the movements of the seat and back rest.

It will be understood that various changes in the details and arrangements of parts which have been herein described and illustrated in order to explain the nature of the invention may be made by those skilled in the art within the principle and scope of the invention as expressed in the appended claims.

I claim:

1. An adjustable chair comprising a support, a seat and a back rest mounted on saidsupport for movements thereon between sitting and tilted positions, a leg rest disposed adjacent the front of said seat, a lazy tong device at each side of the seat for supportingthe leg rest, each said device comprising three pairs of links, one pair having one of its links pivotally connected to the leg rest and the other of its links to said seat, a second pair of said links having one of its links pivoted to said seat and its other link pivoted to one link of said third pair of links, the other link of said third pair being pivoted to said leg rest, that link of one of said pairs which has no direct pivotal connection to either said seat or said leg rest having an extension which is pivoted to a link of another pair of links, and an actuating connection to one link of said device and operable concurrently with movement of said back rest for causing an extension of said device when the back rest moves into tilted position and a retraction of said devices when the back rest returns to its sitting position.

2. An adjustable chair comprising a support, a seat and a back rest mounted on said support for movement thereon between sitting and tilted positions, a leg rest disposed adjacent the front of said seat, a lazy tong device at each side of the seat for supporting the leg rest, each said device comprising three pairs of links, one 'pair having one of its links pivotally connected to the leg rest and the other of its links to said seat, a second pair of said links having one of its links pivoted to said seat and its other link pivoted to one link of said third pair of links, the other link of said third pair being pivoted to said leg rest, said other link of said second pair having an extension which is pivotally connected to that link of said first pair which is pivoted to said seat, that link of said third pair which is pivoted to said leg rest also having an extension that is also pivoted to that link of said first pair which is connected to said seat, and an actuating connection to one link of said device and operable concurrently with movement of said back rest for causing an extension of said device when the back rest moves into tilted position and the retraction of said device when the back rest returns to its sitting position.

3. An adjustable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting and tilted positions, a leg 'rest disposed adjacent the front of said seat, a lazy tong device at each side of the seat for supporting the leg rest, each said device comprising three pairs of links, one pair having one of its links pivotally connected to the leg rest and the other link to said seat, a second pair of said links having one of its links pivoted to said seat and its other link pivoted to one link of said-third pair of links, the other link of said third pair being pivoted to said leg rest, and that link of said first pair which is pivoted to said leg rest extended and pivoted to that link of said second pair which is pivoted to said seat, and that link of said third pair which is pivoted to a link of said second pair having an extension which is pivoted to that link of said first pair to which the leg rest is pivoted, and an actuating connection to one link of said device and operable concurrently with movement of said backrest for causing an extension of said device when the back rest moves into tilted position and a retraction of said device when the back rest returns to is sitting position.

4. An adjustable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting and tilted positions, a leg rest disposed adjacent the front of said seat, a lazy tong device at each side of the seat for supporting the leg rest, each said device comprising three pairs of links, one pair having one of its links pivotally connected to the leg rest and the other of its links to said seat, a second pair of said links having one of its links pivoted to said seat and its other link piovted to one link of said third pair of links, the other link of said third pair being pivoted to said leg rest, the link of said first link pair which is pivoted to said seat extending and pivoted to that link of said third pair which is pivoted to said leg rest, and said link of said second pair which is pivoted to a link of said third pair being extended and pivoted to that link of said first pair to which said seat is pivoted, and an actuating connection to one link of said device and operable concurrently with movement of said back rest for causing an extension of said device when the back rest moves into tilted position and a retraction of said device when the back rest returns to its sitting position.

5. An adjustable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting positions and tilted positions, a leg rest disposed adjacent the front of said seat, a set of three pairs of links at each side of said seat forming a support for the leg rest from the seat, each set having one link of one pair pivoted to said seat and the other link of that pair pivoted directly to said leg rest, one link of another pair pivoted directly to said leg rest, and one link of the third pair pivoted directly to said seat in forward and rearwardlyspaced relation to the pivoted connection to the seat of the said one link of said one pair, the other links of said another and said third pair of the set being directly pivotally connected together, a link of said one pair crossing and pivotally connected to a link of said another pair, and an actuating connection from said back rest to one of said links of a set and operable to cause an extension of said links and thereby an elevation and advancement of said leg rest when the back rest is moved into tilted position, and a guide link pivoted at one end to said supportand at its other end to said actuating link for supporting said seat at its forward part through said links which are pivoted to said seat.

6. An adjustable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting positions and tilted positions, a leg rest disposed adjacent the front of said seat, a set of three pairs of links at each side of said seat forming a support for the leg rest from the seat, each set having one link of one pair pivoted to said seat and the other link of that pair pivoted directly to said leg rest, one link of. another pair pivoted directly to said leg rest, and one link of the third pair pivoted directly to said seat in forward and rearwardly spaced relation to the pivoted connection to the seat of the said one link of said one pair, the other links of said another and said third pair of the set being directly pivotally connected together, a link of said one pair crossing and pivotally connected to a link of 'saidanother pair, andmeans controlled by said will) 9 back rest for supporting the forward part of the seat and changing its inclination in a forward and rearward direction when the back seat is moved into its tilted position and for causing an elevation of the leg rest by an extension of said set of connected links when said back rest is moved into its tilted position.

7. The chair as set forth in claim 6, wherein said other link of said third pair is extended beyond its connection to a link of said another pair and pivotally connected to said one link of said one pair.

8. An adjustable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting andtilted positions, a leg rest disposed adjacent and below the front of said seat, extensible linkage at each side of said seat connecting said leg rest and seat, each such linkage being formed of two links pivoted to and depending from the forward part of said seat in front and rear spaced apart relation toone another, a link pivoted at one of its ends to the lower end of one of said depending links and at its other end directly to said leg rest, another link pivoted at one of its ends to the lower end of the other of said depending links and extending in a direction forwardly and rearwardly of the seat when the latter is in its sitting position, and a pair of links pivoted together and having one link of that pair of links pivoted directly to the leg rest and the other link of that pair pivoted to said forwardly and rearwardly extending link, said another link which is pivoted to the lower end of one of said depending links having an extension beyond its connection to a link of said pair and pivoted to said one of said depending links, means connecting said back rest to said. linkage for moving the latter and through it advancing and elevating said leg rest when the back rest is moved into its said tilted position, and means articulately connecting the support to said connecting means intermediate of the length of the latter for supporting said linkage and seat and causing upward movement of said linkage to elevate the forward part of said seat when said leg rest is advanced by operation of said back rest into its tilted position.

9. An adjustable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting and tilted positions, a leg rest disposed adjacent and below the front of said seat, extensible linkage at each side of said seat connecting said leg rest and seat, each such linkage being formed of two links pivoted to and depending from the forward part of said seat in front and rear, spaced apart relation to one another, a link pivoted at one of its ends to the lower end of one of said depending links and at its other end directly to said leg rest, another link pivoted at one of its ends to the lower end of the other of said depending links and extending in a direction forwardly and rearwardly of the seat when the latter is in its sitting position, and a pair of links pivoted together and having one link of that pair of links pivoted directly to the leg rest and the other link of that pair pivoted to said forwardly and rearwardly extending link, crossing and pivoted to the other link that is pivoted to said leg rest, said another link which is pivoted to the lower end of one of said depending links having an extension beyond its connection to a link of said pair and pivoted to said one of said depending links, means connecting said back rest to said linkage for moving the latter and through it advancing and elevating said leg rest when the back rest is moved into its said tilted position, and means articulately connecting the support to said connecting means intermediate of the length of the latter for supporting said linkage and seat and causing upward movement of said linkage to elevate the forward part of said seat when said leg rest is advanced by operation of said backrest into its tilted position.

10. The chair substantially as set forth in claim 8, wherein one of said links that is pivoted directly to said leg rest crosses and is pivoted to a link that in turn is pivoted to the other link that is directly pivoted to said leg rest.

11. An adjustable chair comprising a support, a seat and a back rest mounted on said support for movements thereon between sitting and tilted positions, a leg rest disposed adjacent the front of said seat, a lazy tong device at each side of the seat for supporting the leg rest, each said device comprising three pairs of links, one pair having one of its links pivotally connected to the leg rest and the other of its links to said seat, the second pair of said links having one of its links pivoted to said seat and its other link pivoted to one link of said third pair of links, the other link of said third pair being pivoted to said leg rest, said one link of said first pair having an extension which is pivoted to a link of another pair of links, and said one link of said third pair having an extension beyond its pivoted connection with the other link of said second pair, said extensions being constraining means in the linkage, and an actuating connection to said device and operable concurrently with movement of said back rest for causing an extension of said device when the back rest moves into tilted position and a retraction of said device when the back rest returns to its sitting position.

References Cited in the file of this patent UNITED STATES PATENTS 2,664,942 Spear Jan. 5, 1954 2,693,845 Hoffman Nov. 9, 1954 2,750,988 Luckhardt June 19, 1956 

